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. 1992 Mar;11(3):855–861. doi: 10.1002/j.1460-2075.1992.tb05123.x

Translocation of pp60c-src to the cytoskeleton during platelet aggregation.

A R Horvath 1, L Muszbek 1, S Kellie 1
PMCID: PMC556525  PMID: 1372252

Abstract

The high amount of pp60c-src in platelets has led to speculation that this kinase is responsible for tyrosine-specific phosphorylation of cellular proteins during platelet activation by different agonists, and is, therefore, implicated in signal transduction of these cells. Unlike pp60v-src, the association of which with the cytoskeleton appears to be a prerequisite for transformation, pp60c-src is detergent-soluble in fibroblasts overexpressing the c-src gene, and its role in normal cellular function remains elusive. To gain a better understanding of the function of pp60c-src we have investigated the subcellular distribution of pp60c-src and its relationship to the cytoskeleton during platelet activation. Quantitative immunoblotting and immunoprecipitation have revealed that pp60c-src is detergent-soluble in resting platelets, while 40% of total platelet pp60c-src becomes associated with the cytoskeletal fraction upon platelet activation. We have also shown that a small pool of pp60c-src is associated with the membrane skeletal fraction which remains unchanged during the activation process. The interaction of pp60c-src with cytoskeletal proteins strongly correlates with aggregation and is mediated by GPIIb/IIIa receptor-fibrinogen binding. We suggest that the translocation of pp60c-src to the cytoskeleton and its association with cytoskeletal proteins may regulate tyrosine phosphorylation in platelets.

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Selected References

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